When a local fisherman (Jack Watson) discovers the bodies of three murdered teenagers, private detective Evan Brent (Bryant Haliday) is sent to the remote island to investigate. With him on the island is a group of archeologists searching for an ancient treasure. After Adam (Mark Edwards), the group's leader, hires a guide to take him, his former girlfriend (Jill Haworth) and another couple across the island, they realize the killer is still on the loose.